<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .btn{
            width: 100px;
            height: 30px;
            background: #4d6ef1;
            color: white;
            border: 0;
            border-radius: 5px;
        }
        .btn:hover{
            background: #3a5ce2;;
        }
    </style>
</head>
<body>
    <input type="button" value="查询" class="btn">
</body>
</html>